Mechanics

DRAIN

1995 Cadillac Brougham

Air Conditioning problem
1995 Cadillac Brougham V8 Two Wheel Drive Automatic 104000 miles

1st AC/heat WORKS FINE. I need to know HOW to clean the drain and where to put the wire? I have removed the under dash panel and pulled carpet back.
On the evaporator box there is a fastner that goes through the firewall on the lover right corner of the box. There is a sponge like washer around this fitting. IT IS WET and appears to be where the water is coming from.
Under the HOOD I have found 1) an open pipe apx 3 8th inch under the two tubes leading through the firewall into the evap box. This open tube is very short and forced ac air comes out of it. I have also located, further down and under the evap box a metal tab that seems to have a flap of insulating material from the evap box that partially covers it. When I can move things around and somehow get some drainage, the water drains from here. It doesnt keep draining though. Go out on the road a bit and park and check under car, NO draining. But it sure IS draining INTO the car pass side and I think from the above mentioned fitting. I dont know where the dang hole is and IF this is the drain? Really weary of fooling with what should be a simple thing. HELP.
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Mattins
June 27, 2010.



That flexible rubber tube under the a/c lines is the drain for the HVAC box. Best bet is to use compressed air to blow back into it. If you use anything hard like wire, Iwould be cautious when inserting it, the a/c evaporator core is right behind the drain.

Tiny
Jack42
Jun 29, 2010.
I dont have a flexible rubber tube. I have as stated the blunt end of a steel tube apx 3/8th of an inch in diameter. There is strong forced cold (ac) air comming out. Could the lack of the tube be a problem why its not draining? The advanced auto pages show an elbow fitting. Do I need something over the open bare end?

Tiny
Mattins
Jun 29, 2010.
No, it should be open to allow the water to flow out, since it isnt really under pressure. There should be a 90 degree elbow outof thefirewall pointing down that is th edrain. Sometimes itis behind a metal shield that hides it. It sounds like the tube you described before is the drain and someone has removed the elbow, which simply directs the water flow

Tiny
Jack42
Jun 29, 2010.
FIrst thank you for your replies. I guess this be my last comment. The drain has some flow. The interior has enough flow into it to be really wet on the carpet. In the original question I referenced a mounting point on the lower right of the evaporator box, this mounting point goes through the firewall, (from the inside) with an apparent sponge like washer around it. THIS is WET and water will weep from it. Here is where the interior leak appears to be. Could there be a restriction some place causing an accumulation to build up inside the box, are there two drains on this car. I also referenced on the firewall BELOW the evaporator box, abt the middle of the car a sort of shield, covered with insulating material. Water seems to drip from here, but apparently not enough. Any final thoughts.
Thank You.

Tiny
Mattins
Jun 30, 2010.
If it has 2 drains one may be where the heater core is located. Is it low on coolant? Usually the drain for the A/C is located where the lines go through the firewall, the other may be for the heater core. A restriction is possible, that is why I suggested blowing into the drain, to force whatever may be blocking it back inside, if there is a restriction at that point a fair amount of water may flow out

Tiny
Jack42
Jun 30, 2010.
Thank you for the blowing suggestion. I did that early on. NO its not a coolant leak it is clear cold water coming from the area of the mounting point on the lower right of the evap box. I keep trying to drive the conversation back to the mounting point on the lower right and why it appears that the leak is from there, I guess I will have to try some other source as to why the mounting point that goes through the firewall, the one with the sponge like washer around it, the one on the lower right of the box is wet and where the leak appears to be coming from. Also was hoping that you would know what the tab sticking out from under the evap box on the fire wall side is and why it is insulated the same as the engine side of the evap box is and occasionally see water seeming to drain from it, but not consistently.
We seem to be talking past each other on those points. I have mentioned them several times.
Matt

Tiny
Mattins
Jun 30, 2010.
That may very well be the drain since itis thenlowest point in the HVAC box.I dont mean to talk past your points, doing this without actually looking at what you are describing can be very frsutrating for both parties involved. LOL. Is there any point that two halves come together where the moisture is gathering at the grommet?

Tiny
Jack42
Jun 30, 2010.